hung_task: add docs for hung_task_detect_count

This commit introduces documentation for hung_task_detect_count in
kernel.rst.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Mingzhe Yang <[email protected]>
Signed-off-by: Lance Yang <[email protected]>
Cc: Bang Li <[email protected]>
Cc: Baolin Wang <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Huang Cun <[email protected]>
Cc: Joel Granados <[email protected]>
Cc: Joel Granados <[email protected]>
Cc: John Siddle <[email protected]>
Cc: Kent Overstreet <[email protected]>
Cc: Ryan Roberts <[email protected]>
Cc: Thomas Weißschuh <[email protected]>
Cc: Yongliang Gao <[email protected]>
Cc: Zi Yan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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